import type { MetadataRoute } from 'next'
import { getPage, getPages, getPosts } from '@/lib/api'

const SITE_URL = process.env.NEXT_PUBLIC_SITE_URL || 'https://blogwoman.de'

function buildUrl(path: string) {
  return `${SITE_URL}${path.startsWith('/') ? path : `/${path}`}`
}

async function getAllPages() {
  const allPages = []
  let page = 1

  while (true) {
    const data = await getPages({ limit: 100, page })
    allPages.push(...data.docs)
    if (!data.hasNextPage) break
    page = data.nextPage || page + 1
  }

  return allPages
}

async function getAllPosts() {
  const allPosts = []
  let page = 1

  while (true) {
    const data = await getPosts({ limit: 100, page })
    allPosts.push(...data.docs)
    if (!data.hasNextPage) break
    page = data.nextPage || page + 1
  }

  return allPosts
}

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const [home, pages, posts] = await Promise.all([
    getPage('home'),
    getAllPages(),
    getAllPosts(),
  ])

  const entries: MetadataRoute.Sitemap = []

  if (home) {
    entries.push({
      url: buildUrl('/'),
      lastModified: home.updatedAt || home.createdAt,
      changeFrequency: 'daily',
      priority: 1,
    })
  }

  pages
    .filter((page) => page.slug !== 'home')
    .forEach((page) => {
      entries.push({
        url: buildUrl(`/${page.slug}`),
        lastModified: page.updatedAt || page.createdAt,
        changeFrequency: 'weekly',
        priority: 0.8,
      })
    })

  const postPrefix: Record<string, string> = {
    blog: '/blog',
    news: '/news',
    press: '/presse',
    announcement: '/aktuelles',
  }

  posts.forEach((post) => {
    const prefix = postPrefix[post.type] || '/blog'
    entries.push({
      url: buildUrl(`${prefix}/${post.slug}`),
      lastModified: post.updatedAt || post.createdAt,
      changeFrequency: 'monthly',
      priority: 0.6,
    })
  })

  return entries
}